CN109113615A

CN109113615A - Core fidelity cabin with pressure-keeping functions

Info

Publication number: CN109113615A
Application number: CN201810917867.1A
Authority: CN
Inventors: 高明忠; 谢和平; 张茹; 陈领; 张泽天; 张志龙; 鲁义强; 李聪; 何志强; 华夏; 明传剑; 彭高友; 陆彤
Original assignee: Sichuan University; Shenzhen University
Current assignee: Sichuan University; Shenzhen University
Priority date: 2018-08-13
Filing date: 2018-08-13
Publication date: 2019-01-01
Anticipated expiration: 2038-08-13
Also published as: CN109113615B; WO2020034358A1

Abstract

The invention discloses a core fidelity chamber with constant pressure function, comprising a mechanical part and a control part, the mechanical part includes an inner core-taking cylinder, an outer core-taking cylinder and an accumulator, and the accumulator is connected to the outer core-taking cylinder through a pipeline , the outer coring barrel is sleeved on the inner coring barrel, and the outer coring barrel is provided with a flap valve; the control part includes a pressure sensor, a three-way stop valve A set on the pipeline, two of the three-way stop valve A The ports are respectively connected to the accumulator and the external coring cylinder, the third port of the three-way stop valve A is connected to the pressure relief valve, the three-way stop valve A is an electronically controlled valve, and the pressure sensor and the three-way stop valve A are connected to the processing unit. , the pressure sensor is used to detect the pressure in the fidelity cabin. The invention can automatically control the pressure in the fidelity chamber, which is beneficial for the core to maintain its state in the in-situ environment.

Description

Core fidelity cabin with pressure-keeping functions

Technical field

The present invention relates to exploration of oil and gas field field more particularly to a kind of core fidelity cabins with pressure-keeping functions.

Background technique

During exploration of oil and gas field, core is discovery oil-gas Layer and research stratum, source bed, oil reservoirs, cap rock, construction Deng capsule information, by the observational study to core, can directly understand lithology, physical property and the oil-containing of subterranean strata, gas, Water attitude Characteristics.After the investment exploitation of oil field, oil reservoir deposition characteristics are further studied and recognized by core, the physical property of reservoir, Pore structure, wetability, relative permeability, lithofacies characteristics, reservoir physics simulation and reservoir water flooding rule；Understanding and grasp are different It development phase, different water cut stages reservoir water flooding feature, gets remaining oil distribution clear, is designed for oilfield development program, series of strata, well pattern Adjustment and Encryption Well provide scientific basis.

Coring is that subsurface rock is got on ground blockingly using special coring tool in drilling process, this The blocking rock of kind is called core, and the various properties of rock can be measured by it, and intuitively Study of The Underground construction and rock are heavy Product environment, understands fluid properties therein etc..In mineral exploration and development process, need by geological design stratigraphic horizon and Depth is carried out drilling work, the tripping in coring tool into well, the core sample drilled through out, and is stored in core storage cabin, In equipment uphill process, the environmental parameters such as pressure of core storage cabin can be reduced, so that core is not able to maintain its environment in situ Under state.

Summary of the invention

The present invention is intended to provide the core fidelity cabin with pressure-keeping functions, can automatically control the pressure in fidelity cabin, have Its state under environment in situ is kept conducive to core.

In order to achieve the above objectives, realization that the present invention adopts the following technical solutions:

Core fidelity cabin disclosed by the invention with pressure-keeping functions, including mechanical part and control section, the machinery Part includes interior coring tube, outer coring tube and accumulator, and the accumulator is connected to outer coring tube, the outer coring tube by pipeline It covers on interior coring tube, the outer coring tube is equipped with flap valve；

The control section includes pressure sensor, the three-way cut-off valve A on pipeline, the three-way cut-off valve A's Two ports are separately connected accumulator and outer coring tube, and the third port of three-way cut-off valve A connects relief valve, three-way cut-off valve A For electrically-controlled valve, the pressure sensor, three-way cut-off valve A are all connected with processing unit, and the pressure sensor is for detecting fidelity Pressure in cabin.

Further, the invention also includes pressure gauge, the pressure gauge is connected to outer coring tube by three-way cut-off valve B.

Further, the inner wall of the interior coring tube adheres to graphene layer.

Further, the film forming agent that drips is filled on the interior coring tube top.

Preferably, the flap valve includes valve seat and flap, and the flap includes elastic seal ring, elastomeric connector strip, close Sealing and multiple successively bolts arranged in parallel, elastomeric connector strip contact all bolts and by elastic seal ring by all bolts Hoop forms overall structure together, there is the card slot being adapted to elastic seal ring on bolt, and elastic seal ring is adjacent in card slot Sealing element is equipped between two bolts, flap one end is movably connected in valve seat upper end by limit hinge；The flap is not being turned down When be arc, flap is bonded with the outer wall of interior coring tube；Flap for plane and covers valve seat upper end when turning down.

Further, the outer coring tube inner wall is equipped with seal chamber, and the turnover panel is located at seal chamber, the seal chamber with it is interior Coring tube connection.

Further, the outer coring tube inner wall is equipped with sealing ring, and the sealing ring is located at the lower section of flap valve.

Preferably, the interior coring tube is PVC material.

Preferably, the power supply of the control section is located on outer coring tube.

The principle of the present invention is as follows: by the pressure in pressure sensor real-time detection fidelity cabin, and with formerly test Core original position pressure compares, and according to the difference of two pressure, controls the on-off of three-way cut-off valve A, increases the pressure in fidelity cabin Add to keep identical as core original position pressure, since environmental pressure of the fidelity cabin in lifting process gradually reduces, rock Core original position pressure is greater than environmental pressure of the fidelity cabin in lifting process, therefore uses pressurized measure.

Beneficial effects of the present invention are as follows:

1, the present invention can Automatic-boosting fidelity cabin, be conducive to the state that core keeps it in situ under environment.

2, panel turnover mechanism of the invention can coring complete when self-closed fidelity cabin, structure is simple, securely and reliably.

3, graphene layer of the invention can reduce resistance to sliding of the core on the inside of pvc pipe, while improve the strong of inside Degree and surface accuracy, enhancing thermal conductivity coefficient etc..

4, seal chamber of the invention can completely cut off the drilling fluid intracavitary by fidelity.

Detailed description of the invention

Fig. 1 is schematic structural view of the invention；

Fig. 2 is structural schematic diagram when flap valve is not turned down；

Fig. 3 is structural schematic diagram when flap valve has been turned down；

Fig. 4 is the structural schematic diagram of flap；

Fig. 5 is the structural schematic diagram of seal chamber；

Fig. 6 is the partial sectional view of interior coring tube；

Fig. 7 is electrical schematic diagram of the invention.

Specific embodiment

In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing, to the present invention into Row is further described.

Core fidelity cabin disclosed by the invention with pressure-keeping functions, including mechanical part and control section, such as Fig. 1 institute Show, mechanical part includes interior coring tube 8, outer coring tube 6 and accumulator 29, and accumulator 29 is connected to outer coring tube by pipeline, interior Coring tube 8 for placing core 1,6 sets of outer coring tube on interior coring tube 6, one end of interior 8 upper end connecting pipe of coring tube, pipe The other end in road connects liquid nitrogen storage tank 25, and pipeline is equipped with electrically-controlled valve 26, and liquid nitrogen storage tank 25 is located in outer coring tube 6, outside Coring tube 6 is equipped with flap valve 3.

Specifically, as shown in Figure 2, Figure 3, Figure 4, flap valve 3 includes valve seat 36 and flap 37, flap 37 includes elastic packing Circle 34, elastomeric connector strip 32, sealing element and multiple successively bolts 35 arranged in parallel, elastomeric connector strip 32 go here and there all bolts 35 Overall structure even and by elastic seal ring 34 by all bolts 35 hoop is formed together, is had on bolt 35 and is adapted to elastic seal ring Card slot 31, elastic seal ring 34 is equipped with sealing element, 3 one end of flap passes through limit in the card slot 31 between two neighboring bolt 35 Position hinge 33 is movably connected in 36 upper end of valve seat；Flap 37 is arc, the outer wall patch of flap 37 and interior coring tube 8 when not turning down It closes；Flap 37 for plane and covers 36 upper end of valve seat when turning down.

As shown in fig. 7, control section includes pressure sensor 5, the three-way cut-off valve A210 on pipeline, threeway cut-off Two ports of valve A210 are separately connected accumulator 29 and outer coring tube 6, and the third port of three-way cut-off valve A210 connects pressure release Valve 211, three-way cut-off valve A210 are electrically-controlled valve, and pressure sensor 5, three-way cut-off valve A210 are all connected with processing unit, and pressure passes Sensor 5 is used to detect the pressure in fidelity cabin.The invention also includes pressure gauge 212, pressure gauge 212 passes through three-way cut-off valve B213 It is connected to outer coring tube.

As shown in figure 5, outer 6 inner wall of coring tube is equipped with seal chamber 39, the turnover panel is located at seal chamber, the seal chamber with it is interior Coring tube connection.

As shown in fig. 6, interior coring tube 8 uses PVC material, the inner wall of interior coring tube 8 adheres to graphene layer 81, interior coring tube The film forming agent 82 that drips is filled on 8 tops, and the film forming agent 82 that drips is located at 7 lower section of piston.

Certainly, the present invention can also have other various embodiments, without deviating from the spirit and substance of the present invention, ripe Various corresponding changes and modifications, but these corresponding changes and modifications can be made according to the present invention by knowing those skilled in the art All it should fall within the scope of protection of the appended claims of the present invention.

Claims

1. The rock core fidelity chamber with constant pressure function is characterized in that: it comprises a mechanical part and a control part, and the mechanical part comprises an inner coring barrel, an outer coring barrel and an accumulator, and the accumulator passes through the pipeline communicate with an outer core-taking cylinder, the outer core-taking cylinder is sleeved on the inner core-taking cylinder, and the outer core-taking cylinder is provided with a flap valve;

The control part includes a pressure sensor, a three-way stop valve A arranged on the pipeline, the two ports of the three-way stop valve A are respectively connected to the accumulator and the external core cylinder, and the third port of the three-way stop valve A is connected. Connect the pressure relief valve, the three-way stop valve A is an electronically controlled valve, the pressure sensor and the three-way stop valve A are all connected to the processing unit, and the pressure sensor is used to detect the pressure in the fidelity cabin.

2 . The core fidelity chamber with constant pressure function according to claim 1 , further comprising a pressure gauge, and the pressure gauge communicates with the external coring barrel through a three-way stop valve B. 3 .

3 . The core fidelity chamber with constant pressure function according to claim 1 , wherein a graphene layer is attached to the inner wall of the inner coring barrel. 4 .

4 . The core fidelity chamber with constant pressure function according to claim 2 , wherein the upper part of the inner coring barrel is filled with dripping film-forming agent. 5 .

5. The core fidelity chamber with constant pressure function according to any one of claims 1-4, wherein the flap valve comprises a valve seat and a valve flap, and the valve flap comprises an elastic sealing ring, The elastic connecting strip, the sealing element and a plurality of lock strips arranged in parallel in sequence, the elastic connecting strip connects all the lock strips in series, and the elastic sealing ring hoops all the lock strips together to form an integral structure. The matching card slot, the elastic sealing ring is installed in the card slot, a seal is arranged between the two adjacent lock bars, and one end of the valve flap is movably connected to the upper end of the valve seat through the limit hinge; Arc-shaped, the valve disc fits with the outer wall of the inner core barrel; the valve disc is flat when turned down and covers the upper end of the valve seat.

6 . The core fidelity chamber with constant pressure function according to claim 5 , wherein the inner wall of the outer coring barrel is provided with a sealing cavity, the flap is located in the sealing cavity, and the sealing cavity is connected to the inner wall. 7 . The coring barrel is connected.

7 . The core fidelity chamber with constant pressure function according to claim 5 , wherein a sealing ring is provided on the inner wall of the outer core barrel, and the sealing ring is located below the flap valve. 8 .

8 . The core fidelity chamber with constant pressure function according to claim 5 , wherein the inner coring barrel is made of PVC. 9 .

9 . The core fidelity chamber with constant pressure function according to claim 1 , wherein the power supply of the control part is located on the outer coring barrel. 10 .